GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/tcpdump/privsep_fdpass.c Lines: 0 50 0.0 %
Date: 2017-11-13 Branches: 0 16 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: privsep_fdpass.c,v 1.8 2012/04/04 17:24:50 deraadt Exp $	*/
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/*
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 * Copyright (c) 2002 Matthieu Herrb
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 * Copyright (c) 2001 Niels Provos <provos@citi.umich.edu>
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include "privsep.h"
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void
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send_fd(int sock, int fd)
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{
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	struct msghdr msg;
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	union {
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		struct cmsghdr hdr;
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		char buf[CMSG_SPACE(sizeof(int))];
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	} cmsgbuf;
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	struct cmsghdr *cmsg;
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	struct iovec vec;
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	int result = 0;
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	ssize_t n;
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	memset(&msg, 0, sizeof(msg));
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	if (fd >= 0) {
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		msg.msg_control = (caddr_t)&cmsgbuf.buf;
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		msg.msg_controllen = sizeof(cmsgbuf.buf);
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		cmsg = CMSG_FIRSTHDR(&msg);
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		cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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		cmsg->cmsg_level = SOL_SOCKET;
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		cmsg->cmsg_type = SCM_RIGHTS;
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		*(int *)CMSG_DATA(cmsg) = fd;
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	} else
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		result = errno;
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	vec.iov_base = &result;
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	vec.iov_len = sizeof(int);
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	msg.msg_iov = &vec;
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	msg.msg_iovlen = 1;
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	if ((n = sendmsg(sock, &msg, 0)) == -1)
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		warn("%s: sendmsg(%d)", __func__, sock);
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	if (n != sizeof(int))
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		warnx("%s: sendmsg: expected sent 1 got %ld",
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		    __func__, (long)n);
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}
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int
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receive_fd(int sock)
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{
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	struct msghdr msg;
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	union {
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		struct cmsghdr hdr;
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		char buf[CMSG_SPACE(sizeof(int))];
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	} cmsgbuf;
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	struct cmsghdr *cmsg;
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	struct iovec vec;
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	ssize_t n;
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	int result;
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	int fd;
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	memset(&msg, 0, sizeof(msg));
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	vec.iov_base = &result;
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	vec.iov_len = sizeof(int);
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	msg.msg_iov = &vec;
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	msg.msg_iovlen = 1;
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	msg.msg_control = &cmsgbuf.buf;
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	msg.msg_controllen = sizeof(cmsgbuf.buf);
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	if ((n = recvmsg(sock, &msg, 0)) == -1) {
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		warn("%s: recvmsg", __func__);
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		return -1;
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	}
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	if (n != sizeof(int))
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		warnx("%s: recvmsg: expected received 1 got %ld",
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		    __func__, (long)n);
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	if (result == 0) {
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		cmsg = CMSG_FIRSTHDR(&msg);
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		if (cmsg == NULL) {
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			warnx("%s: no message header", __func__);
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			return (-1);
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		}
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		if (cmsg->cmsg_type != SCM_RIGHTS)
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			warnx("%s: expected type %d got %d", __func__,
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			    SCM_RIGHTS, cmsg->cmsg_type);
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		fd = (*(int *)CMSG_DATA(cmsg));
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		return (fd);
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	} else {
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		errno = result;
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		return (-1);
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	}
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}